Secondary battery

Abstract

The invention relates to a secondary battery. The secondary battery comprises a naked battery cell, a first insulating cover and a second insulating cover, a first current collection part and a second current collection part, wherein the naked battery cell comprises a battery cell body, a first tab and a second tab; the first current collection part comprises an electrode pole connecting section, a transition section and a tab connecting section which are connected; the electrode pole connecting section is of a bent structure and forms a positioning cavity; the first insulating cover comprises a base body, and a positioning part and a clamping claw which are connected to the base body; the base body is provided with a containing space which is opened toward the first tab; the first tab is stored in the containing space; the positioning part is embedded into the positioning cavity; the clamping claw is in clamping joint with the transition section so that the first current collection part is in positioning connection with the first insulating cover; the second insulating cover covers the second tab; a gap is formed between the first insulating cover and the second insulating cover. According to the scheme provided by the invention, the risk that the he first insulating cover and the second insulating cover are expanded or torn so that the tabs are exposed is reduced, and the probability that the inner part of the secondary battery is short-circuit is reduced.

Description

technical field [0001] The present application relates to the technical field of energy storage devices, in particular to a secondary battery. Background technique [0002] A secondary battery includes a top cover, a casing, a bare cell, a collector plate, a pole, and an insulator, etc. The bare cell is set in the cavity formed by the top cover and the shell, and the insulator is wrapped outside the bare cell to realize the insulation between the bare cell and the shell. The collector plate connects the bare cell and the pole. The poles are used to output the electric energy in the bare cells to the outside of the secondary battery through the poles. [0003] However, in the process of charging and discharging, gas will be generated inside the bare cell, and the bare cell will easily expand under the action of air pressure, and the resulting expansion force will cause the insulation wrapped around the bare cell to be stretched. Open or tear, resulting in tabs exposed to th...

AI Technical Summary

Problems solved by technology

[0003] However, in the process of charging and discharging, gas will be generated inside the bare cell, and the bare cell will easily expand under the action of air pressure, and the resulting expansion force will cause the insulation wrapped around the bare cell to be stretched. Open or tear, causing the tabs to be exposed to the outside of the insulator, especially for bare cells with side tab structures, the exposed tabs are easy to contact with the shell, resulting in an internal short circuit of the secondary battery

Images